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AUSCERT External Security Bulletin Redistribution
Microsoft Security Bulletin MS16-046: Security Update for
Secondary Logon (3148538)
13 April 2016
AusCERT Security Bulletin Summary
Product: Microsoft Windows
Operating System: Windows 10
Impact/Access: Administrator Compromise -- Existing Account
CVE Names: CVE-2016-0135
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Microsoft Security Bulletin MS16-046: Security Update for Secondary Logon
Bulletin Number: MS16-046
Bulletin Title: Security Update for Secondary Logon
KB Article: 3148538
Published Date: April 12, 2016
This security update resolves a vulnerability in Microsoft Windows. An
attacker who successfully exploited this vulnerability could run arbitrary
code as an administrator.
This security update is rated Important for all supported editions of Windows
10. For more information, see the Affected Software section.
The security update addresses the vulnerability by correcting how Windows
Secondary Logon Service handles requests in memory.
Windows 10 for 32-bit Systems 
Windows 10 for x64-based Systems 
Windows 10 for x64-based Systems 
Windows 10 Version 1511 for 32-bit Systems 
Windows 10 Version 1511 for x64-based Systems 
Windows 10 updates are cumulative. The monthly security release includes
all security fixes for vulnerabilities that affect Windows 10, in addition to
non-security updates. The updates are available via the Microsoft Update
Secondary Logon Elevation of Privilege Vulnerability - CVE-2016-0135
An elevation of privilege vulnerability exists in Microsoft Windows when the
Windows Secondary Logon Service fails to properly manage requests in memory.
An attacker who successfully exploited this vulnerability could run arbitrary
code as an administrator. An attacker could then install programs; view,
change, or delete data; or create new accounts with full user rights.
To exploit this vulnerability, an attacker must first log on to the system. An
attacker could then run a specially crafted application that could exploit the
vulnerability and take control of an affected system. The security update
addresses the vulnerability by correcting how the Windows Secondary Logon
Service handles requests in memory.
The following table contains a link to the standard entry for each
vulnerability in the Common Vulnerabilities and Exposures list:
Vulnerability Title CVE number Publicly disclosed Exploited
Secondary Logon Elevation of Privilege Vulnerability CVE-2016-0135 Yes No
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